Flue gas desulfurization serial-column device

The utility model discloses a flue gas desulfurization serial-column device, which comprises an absorption column A (1), an absorption column B (2), a flue (3) and a communication pipeline (4), wherein the top of the absorption column A (1) is connected with the middle of the absorption column B (2) through the flue (3), and the bottoms of the absorption column A (1) and the absorption column B (2) are connected together through the communication pipeline (4). The flue gas desulfurization serial-column device disclosed by the utility model not only can effectively remove sulfur dioxide in flue gas, but also has the advantages of simple structure, low cost and low power consumption.